Sushruta Samhita
अधिकृत्य कृतं यस्मात्तन्त्रमेतदुपद्रवान् । औपद्रविक इत्येष तस्याग्र्यत्वान्निरुच्यते ॥३०॥
Since this Tantra has been compiled by an authorized person, it is considered as a primary work. It is referred to as "Upadravika" due to its prominent status.
english translation
adhikRtya kRtaM yasmAttantrametadupadravAn । aupadravika ityeSa tasyAgryatvAnnirucyate ॥30॥
hk transliteration by Sanscript